How to fix the current, voltage and resistance readings of the digital multimeter are not accurate
According to my maintenance experience. First you need to make sure your multimeter battery voltage is normal, 9V battery voltage, if the battery voltage is normal, check the A/D reference voltage. Generally it is 100mV, if the A/D reference voltage deviates from 100mV, it will appear If the measurement error becomes larger, you can adjust the calibration reference voltage through the vR1 variable resistor to perform calibration. The A/D model of the DT9205A digital meter is ICL7106. The 32 feet and 36 feet of the 7106 are the reference point presser foot detection points. The vR1 variable resistor can also calibrate the DC voltage measurement value. The capacitance file adjustment calibration is calibrated through the VR3 variable resistor adjustment.
How to repair dt9205 digital multimeter burned
In addition to changing the battery, insurance, and switch, the maintenance of this watch is not very meaningful, and the low-value watch is only about 40 yuan for a new one.
Digital multimeter dt-9205a has no display, nothing is wrong
If it is not out of power, and burning the meter, you can look at the automatic shutdown delay capacitor 16V/47UF. If my meter does not display, the capacitor is broken, and it is normal after replacement.
When using a multimeter, I wrongly used the diode file to measure the AC 400V voltage, what components will be burned?
Burned may be:
1) The current limiting resistor connected in series with the meter head;
2) the header itself;
I suggest you try the current file:
If the current file does not display the current, it can actually pass the current. Then it can be proved that there are only the above two damage possibilities.
If the current gear has neither a display value nor an actual current passing through, the damage has been extended to the current gear resistor and the core chip in it.
The multimeter uses the 20ma current range to measure the 220V AC voltage and how to repair it, and the multimeter measures the maintenance of the AC burnout insurance.
